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WorksheetsChemistry Unit Assessment
Total questions: 32
Worksheet time: 16mins
Referencing the periodic table, what do the elements fluorine, chlorine, and bromine have in common?
All are located in the same period.
All have metallic properties.
All are halogens, so they are not very chemically active.
All have the same number of valance electrons.
What does X represent?
atomic mass
atomic number
name of the element
number of valence electrons
What does Y represent?
atomic mass
atomic number
name of the element
number of valence electrons
What does Z represent?
atomic mass
atomic number
name of the element
number of valence electrons
Which diagram represents a mixture?
the first (top) one
the second one
the third one
the fourth (bottom) one
Which statement is true about the organization of matter?
Atoms can be broken down into particles called elements and compounds.
Atoms make up elements the can chemically combine to form compounds.
Compounds are composed of elements that chemically combine to form atoms.
Elements are composed of compounds that chemically combine to form atoms.
Which statement describes a chemical property?
Steel is shaped into automobile fenders.
Water begins to boil when it reaches 100° C.
Oil floats on water because it is less dense.
Iron slowly forms rust when exposed to oxygen gas.
Which example shows a change in state of matter?
liquid pouring
wood burning
nail rusting
ice melting
A substance changed from one state of matter to another. The image shows its particle motion in the first state and the second state. How is the transition between State 1 and State 2 best described?
solid state to liquid state
liquid state to solid state
liquid state to gaseous state
gaseous state to solid state
The image shows an atom arrangement. Why is it considered a mixture?
It is composed of one kind of atom.
It is composed of extremely small particles.
It is a physical combination of two or more different substances.
It is composed of two or more types of elements that are chemically combined.
Examine the structure of an atom. What are the negatively charged particles?
electrons
neutrons
protons
quarks
Which image is the best example of a chemical change?
fireworks exploding
cutting paper
crushing a can
snow melting
Ammonia is made up of two pure substances: nitrogen and hydrogen. What can be true for ammonia, nitrogen and hydrogen?
Ammonia is a mixture, and nitrogen and hydrogen are elements.
Ammonia is a mixture, and nitrogen and hydrogen are compounds.
Ammonia is a compound, and nitrogen and hydrogen are elements.
Ammonia is an element, and nitrogen and hydrogen are compounds.
The diagram shows a model of an atom of a particular element. Which element is represented by this model?
Water, a stable liquid, is formed when two flammable gases, hydrogen and oxygen, combine. What has happened?
At atom has been created.
A compound has been created.
A mixture has been created.
An element has been created.
When chemical W is added to a liquid, the chemical breaks down into substances X, Y and Z into simpler substances. It is not possible to break down substances X, Y and Z into simpler substances. What conclusion is supported by this evidence?
Chemical W is an element.
Chemical W is a pure substance.
Substances X, Y and Z are elements.
Substances X, Y and Z are compounds.
Which property of copper makes it ideal to create thin sheets of copper?
density
magnetism
malleablility
solubility
A student adds 50 g of sugar to two test tubes, 1 and 2. The student adds 50 mL of water in Test Tube 1 and 50 mL of sulfuric acid in Test Tube 2. The diagram shows the observations.
Test tube 1 is a chemical change and test tube 2 is a physical change.
Test tube 1 is a physical change and test tube 2 is a chemical change.
Both test tubes are physical changes.
Both test tubes are chemical changes.
Review the information about element C. How many neutrons are present in an atom of element C?
2
6
12
18
Which statement describes a chemical change?
When baking soda is mixed with vinegar, bubbles are formed.
When a beaker of water is heated, bubbles rise to the surface of the liquid.
When a piece of wax is heated, it becomes a liquid.
When sugar is placed in a beaker of water, the sugar dissolves.
There are many gases in our atmosphere. Which gas is made by combining two different elements?
Which term represents a physical property of matter?
density
flammability
reactivity
toxicity
How does a chemical equation support the law of conservation of matter?
The left must be greater than the right.
The right must be greater than the left.
Both sides must have the same number of atoms.
Both sides must have the same atoms and the same number of atoms.
How is the Law of Conservation of Matter best represented in a chemical reaction?
The mass of the products is greater than the mass of the reactants.
The mass of the reactant is greater than the mass of the products.
The mass of the reactants is equivalent to the mass of the products.
The mass of the reactants has no relationship to the mass of the products.
What is the significance of a column in the periodic table?
A column, better known as a group, includes elements with similar properties.
A column, better known as a period, includes elements with similar properties.
A column, better known as a group, includes elements with the same number of electrons.
A column, better known as a period, includes elements with the same number of electrons.
An atom of chlorine has an atomic number of 17 and an atomic mass of 35. How many protons and neutrons are in the atom?
17 protons and 17 neutrons
17 protons and 18 neutrons
18 protons and 17 neutrons
18 protons and 18 neutrons
How are the elements organized in the periodic table?
Elements are ordered by atomic weight.
Elements are ordered by atomic number.
Elements are arranged alphabetically.
Elements are grouped by color.
What statement about the periodic table is true?
Elements in the same columns have similar properties.
Elements in the same row share similar properties.
Elements on the left have a larger nucleus than elements on the right.
Elements at the top of each column have the highest atomic mass in that column.
What statement best describes the Law of Conservation of Mass?
Matter can be created but not destroyed in a chemical reaction.
Matter can be destroyed but not created in a chemical reaction.
Matter can be created and destroyed in a chemical reaction.
Matter can be neither created nor destroyed in a chemical reaction.
A student is examining three diagrams that show particle arrangements in a solid, liquid and gas. Which order shows the sequence of decreasing kinetic energy of the particles (from highest kinetic energy to least kinetic energy)?
S, R, Q
R, Q, S
Q, R, S
Which atom arrangement represents an element?
Which chemical equation supports the Law of Conservation of Matter?
2H + O2 ⟶ 2H2O
H2 + O2 ⟶ H2O
H2 + O2 → 2H2O
2H2 + O2 → 2H2O
